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Stiles is tired. Tired of trying, tired of existing. After Theo, Scott still won't let him back, Malia won't look at him. Falling deeper and deeper into himself, he sets out to kill himself. Only when he hits the bottom he realises he doesn't want to die. He doesn't.
Something changes that day. No longer is he the same weak human. Something is different and Scott is too oblivious to notice.
It is when Derek comes back does anyone notice something is wrong. It is when Derek tries to make amends that he notices Stiles is different.
Derek cannot look away. Stiles doesn't want to be seen.